Programmer Group

Let's look at a piece of code to simulate the addition, deletion, modification and query function of the database Define an interface, which is the function list of the database package test.dynamicagent; public interface User { public abstract void add(); //increase public abstract void delete(); //Delete public abstract void up ...

  Mybatis plus is a mybatis enhancement tool to simplify development and improve efficiency. The abbreviation mp is used below   To simplify the representation of mybatis plus  ， This article mainly introduces the use of mp with SpringBoot. Note: the mp version used in this article is the latest version 3.4.2. Please refer to ...

catalogue resmbms Technical highlights Preparation for project construction Implementation of login function Login function optimization Implementation of login and logout function Login interception optimization Password modification Optimize password modification using AJAX User management implementation 1. Get the number of users ...

Chapter 5 functions Function allows us to package a statement sequence into a unit, and then call it many times from other parts of the program. The mechanism of function allows us to decompose a large work into small tasks. We have touched on functions before, and we will discuss more features of functions in this chapter 5.5 function value ...

Niu Ke's Diary (November 3, 2021) Title: Which of the following exceptions is a check type exception that needs to be declared when writing a program ( ) A.NullPointerException B.ClassCastException C.FileNotFoundException D.IndexOutOfBoundsException Resolution: Correct answer: C Here is the reference The pink ones are checked excep ...

  Ribbon is a load balancing project under Netflix, which mainly realizes the load balancing of middle tier applications. After configuring the service provider address list for the Ribbon, the Ribbon will automatically help the service caller to request based on a load balancing algorithm. The Ribbon provides a variety of load balancing a ...

The basic operations of String class can be divided into the following categories: 1. Basic operation method 2. String comparison 3. Conversion between string and other data types 4. Character and string lookup 5. Interception and splitting of strings 6. String replacement and modification 1, String basic operation method First, let's ta ...

preface I personally think java multithreading is the most difficult part of javaSe. I have learned it before, but I don't know how to start with the real needs of multithreading. In fact, I don't have a deep understanding of multithreading, the application scenario of multithreading api, the running process of multithreading, etc, This articl ...

aggregate First: Set concept The container of the object, which implements the common operations on the object, similar to the array function. Two: Differences between sets and arrays (1) Array length is fixed, set length is not fixed. (2) Arrays can store basic types and reference types, and collections can only reference types. Collecti ...

1. Overview and classification of code blocks 1. Code block overview      In Java, code enclosed with {} is called a code block. 2. Code block classification      According to its location and declaration, it can be divided into local code block, construction code block, static code block and synchronous code b ...